Comet C/2025 A6 (Lemmon)
Taken by Mieczyslaw Leszek Paradowski on October 20, 2025 @
Pryszczowa Góra, Poland
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Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: Unavailable
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Details:
Comet C/2025 A6 (Lemmon) on 20 October 2025 at 17:30 UT (center) observed in Pryszczowa Góra, Poland. The sky was clear - Bortle 4.6; temperature: -1 C. The comet altitude: 17d34'.
Telescope: Camera lens Jupiter 37A f=135mm/3.5 @f/4.
Camera: Canon 6D 1600 ISO.
Exposure: 41x30s - integration time 20.5 min.
Tracker mount: Star Adventurer.
Processing: DeepSkyStacker, IRIS - written by Christian Buil, GIMP.
All calibrated frames (darks, bias, flats) were stacked on the comet.
FOV 10.2deg x 15.3deg. Aperture photometry of the comet performed in IRIS. Measured total magnitude mC=4.2 +/-0.1 mag, magnitude in V band mV=4.3 +/-0.1 mag @Dia=20'. Tail: 12deg in p.a. 10deg.
Effective diameter of the comet's nucleus is 4.4 (+/-1.2) km assuming phase coefficient 0.030 +/-0.005 mag/deg and albedo 0.04, and using my method published in Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 3, March 2020 Pages 4175-4188, https://doi.org/10.1093/mnras/stz3597
Photographer's website:
No URL provided.
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